RANDOM CHEMISTRY QUIZ
Which of the following is the property of covalent compound ?
Dissolves in organic solvent
Which characteristic is correct about elements in Group 17 in the Periodic Table as going down the group ?
The tendency to accept an electron decreases
C2H4 + H2 ---> C2H6
What is the catalyst used ?
Nickel
Which of the conditions are used in the hydration process of ethene ?
Catalyst is phosphoric acid & temperature is 300
Groups are the____columns in the Periodic Table of Elements.
vertical
What is another name of Group 17?
Halogen
When Z reacts with water, an alkaline hydroxide solution and a colorless gas are formed. Name the gas.
Hydrogen gas
Isomers are____that have the same molecular formula but different_____formulae.
molecules, structural
State functional group for alcohol and its general formula.
Functional group :____
General formula:____
hydroxyl, CnH2n+1OH
Covalent bond is a ___ bonds formed through sharing of ____ between non-metal atoms.
chemical, electron
Caffeine can be a natural____for plant.
fertiliser
Fertilisers usually have a high content of ___. Nitrogen is needed to enhance the ___ of plants such as vegetables. Among the examples of fertilisers used by farmers are___, CO(NH2)2.
nitrogen, growth, urea
Based on the percentage of nitrogen by mass in caffeine and urea, determine the best fertilisers that should be used by farmers for their plants. Explain.
-_____is the best fertiliser.
-This is because urea fertiliser contains a higher percentage of
____ than caffeine.
urea, nitrogen
What is the function of the limewater?
To detect the presence of ______.
carbon dioxide gas
State the name of reaction to prepare the insoluble salt.
Double decomposition reaction
Briefly describe how to prepare salt crystals from Solid X.
-Filter the precipitate X formed using ____.
-The precipitate is then rinsed with _____.
-The salt crystals formed are___ between sheets of filter paper.
filter paper, distilled water, dried
Composite materials consist of a combination of matrix substance and strengthening substance. What is the function of matrix substances?
-The matrix substances____ and binds the___substance together.
surrounds, strengthening
Name a suitable composite material for making kayaks.
Fibre glass
As a student studying chemistry, how can you help Adam to explain why hot food should not be served in lead glass containers.
-Lead melts___ when placing hot food.
-Then lead will ____ into the food.
-At risk of ___ poisoning.
easily, dissolve, lead
The lenses of Elly glasses are made of a type of lead glass. Elly found that it was glare especially when under the sun. Elly wants to change to another type of mirror lens. In your opinion, what type of glass mirror should Elly choose to overcome the problems faced. Suggest the advantages of the selected glass mirror.
-___ glass
-Does not absorb ___ rays
-Not sensitive to ____
photochromic, ultraviolet, light
Heat of combustion is the heat ____ when 1 mole of fuel is burnt ___ in excess ___.
released, completely, oxygen
State the type of reaction for the combustion of alcohol.
Exothermic reaction
Compare and explain why there is a difference in the value of heat of combustion between propanol and butanol.
-The number of ___ atoms per molecule in ____ is higher than____, thus, producing___ heat of combustion.
-The number of carbon dioxide and water molecules produced is____.
carbon, butanol, propanol, greater, higher
Elisa conducted an experiment to study the rate of decomposition of hydrogen peroxide, H2O2 in the laboratory. Elisa used a spatula of black powder as a catalyst for the experiment. Elisa found that the accumulated gas could ignite a glowing wooden splinter. Name gas produced and probably catalyst used.
oxygen gas, copper(II) oxide
Enzymes work optimally at a temperature of ___C(body temperature)
37
Enzymes become____at high temperature and
lost the ability to____ the reaction rate.
denatured, speed up
Polymerisation is the process of producing___ chain molecules from their ____.
long, monomers
The synthetic polymer X is used in making fishing nets. What is the type of polymerization for the formation of polymer X?
Condensation polymerisation
What molecules are removed from the polymerization?
Water
Explain why drawn polymers are also called polyesters.
Has a carboxylate group
State the characteristics of a good synthetic polymer.
-Good ____ insulation.
-Light, strong and ___.
-___ and non-reactive.
-High ____ resistance.
thermal, hard, inert, heat
Media clippings show the ban on the use of plastic straws by the Kangar Municipal Council (MPK). The use of plastic takes up to 450 years to decompose. How can you help to shorten the decomposition period of these plastic straws? Explain the method and its two advantages to the environment.
-Method : Using___ plastic
-____ are included to allow plastic items to decompose ____
-by bacteria through___
-Plastic items will decompose ___.
Advantages to the environment :
-Reduce the problem of dumping____ goods in ___.
-Save wild animals and aquatic life from being ____and extinct.
biodegradable, additives, naturally, biodegradation, faster, plastic, landfills, devoured
Although Malaysia is one of the main producers of rubber in the world, the use of synthetic rubber is more widespread in the industry than natural rubber. What factors contribute to this situation?
-Synthetic rubber is more___ resistant and suitable for Malaysia's climate which is hot and humid throughout the year.
-The special properties found in synthetic rubber allow it to produce a variety of rubber-based products.
-Synthetic rubber is more resistant to ___.
-Synthetic rubber is more resistant to ____.
-Synthetic rubber act as a ___ insulator.
-Synthetic rubber is more___.
-Synthetic rubber is ____.
heat, chemicals, oxidation, heat, elastic, harder
Corrosion of metal is a __ reaction where the metal is oxidised ___ when the metal atoms release___ to form metal ___.
redox, spontaneously, electrons, ions
-Metal corrosion occur
-Cu--->Cu2+ + 2e
-Metal X is___
-____precipitate form
oxidised, blue
-Metal corrosion occur
-Fe--->Fe2+ + 2e
Fe2+---> Fe3+ + 2e
-Metal Y is____
-___precipitate form
oxidised, brown
By using iron(II) sulphate solution, dilute sulphuric acid and bromine water,describe one laboratory experiment to show the transfer of electrons at a distance. In your description include :
● labelled diagram : U-tube
●procedure of experiment
-Pour dilute ____ acid into the U-tube.
-Using a ____, add iron(II) sulphate solution at one arm of the U-tube.
-Add ____ water at another arm of the U-tube.
-Dip ____ electrode into each side of the U-tube.
-Connect the carbon electrodes to a____ with connecting wires to complete the ___ circuit.
-Record any change that can be observed after 30 minutes.
sulphuric, dropper, bromine, carbon, galvanometer, external